diff --git a/README.md b/README.md
index fa3f4ad5c0483c767c563265150ed765edb3cb3b..f172007efbdf0f5517da80de6415807af3a56918 100644
--- a/README.md
+++ b/README.md
@@ -117,5 +117,26 @@ Decisions are discussed within MR of a given decision md file.
## meta-ohos overview
-
+**OpenHarmony** is a distributed OS that is designed to run atop variety of OS kernels
+ranging from RTOSs to Linux.
+
+**meta-ohos** is a _umbrella_ meta layer containing all layers required to build
+**OpenHarmony** Image basing on existing kernel meta-layers.
+
+```plantuml
+!includeurl https://raw.githubusercontent.com/RicardoNiepel/C4-PlantUML/release/1-0/C4_Context.puml
+
+Person(dev, "Developer", "Anyone willing to build the OHOS based image")
+System(meta_ohos, "meta-ohos", "Open Harmony OS umbrella bitbake meta-layer")
+System_Ext(yocto, "yocto-poky", "distro scaffolding: predefined meta-data, bitbake build system")
+System_Ext(meta_zephyr, "meta-zephyr", "ZephyrOS meta-layer")
+System_Ext(meta_freertos, "meta-freertos", "FreeRTOS meta-layer")
+
+Rel(dev, yocto, "selects configuration, initiates the build, deploys image to the target")
+Rel(yocto, meta_ohos, "incorporates meta-layers relevant for selected kernel / configuration")
+Rel(yocto, yocto, "Using meta-poky for OHOS on Poky build")
+Rel(yocto, meta_zephyr, "incorporates for OHOS on Zephyr build")
+Rel(yocto, meta_freertos, "incorporates for OHOS on FreeRTOS build")
+
+```
diff --git a/diagrams/0001-meta-ohos-zephyr-build-seqence.puml b/diagrams/0001-meta-ohos-zephyr-build-seqence.puml
deleted file mode 100644
index 2ca0707f90bdd0a7d846c1a19aaa157d68fcc2cc..0000000000000000000000000000000000000000
--- a/diagrams/0001-meta-ohos-zephyr-build-seqence.puml
+++ /dev/null
@@ -1,30 +0,0 @@
-@startuml 0001-meta-openharmony-zephyr-build-sequence-diagram
-!includeurl https://raw.githubusercontent.com/RicardoNiepel/C4-PlantUML/release/1-0/C4_Container.puml
-
-LAYOUT_AS_SKETCH()
-
-Person(dev, "Developer", "Anyone willing to build the OHOS based image")
-System_Boundary(meta_openharmonyn, "meta-openharmony") {
- Container(meta_ohos_zephyr, "meta-ohos-zephyr", "meta-layer", "OHOS configuration / adaptation layer for Zephyr")
- Container(meta_ohos_poky, "meta-ohos-poky", "meta-layer", "OHOS configuration / adaptation layer for Poky")
- Container(meta_ohos_init, "meta-ohos-init", "meta-layer", "OHOS initialisation services for application devices")
- Container(meta_ohos_init_lite, "meta-ohos-init-lite", "meta-layer", "OHOS initialisation services for uC-based devices")
- Container(meta_ohos_softbus, "meta-ohos-softbus", "meta-layer", "OHOS softbus service for application devices")
- Container(meta_ohos_softbus_lite, "meta-ohos-softbus-lite", "meta-layer", "OHOS softbus service for uC-based devices")
-}
-Container(meta_zephyr, "meta-zephyr", "meta-layer", "ZephyrOS meta-layer")
-System_Ext(yocto, "yocto-poky", "distro scaffolding: predefined meta-data, bitbake build system")
-
-Rel(dev, meta_ohos_zephyr, "1. selects OHOS Zephyr distribution", "environment shell script")
-Rel(meta_ohos_zephyr, yocto, "2. sets up bitbake environment for OHOS Zephyr", "local.conf.sample, bblayers.conf.sample")
-Rel(dev, yocto, "3. initiates the build", "bitbake")
-Rel(yocto, meta_ohos_init_lite, "4. incorporates Zephyr-compatible OHOS layers")
-Rel(yocto, meta_ohos_softbus_lite, "4. incorporates Zephyr-compatible OHOS layers")
-Rel(yocto, meta_zephyr, "4. incorporates")
-
-Lay_D(dev, yocto)
-Lay_D(dev, meta_openharmonyn)
-Lay_D(meta_ohos_zephyr, meta_ohos_init_lite)
-Lay_D(meta_ohos_init_lite, meta_ohos_softbus_lite)
-Lay_D(meta_zephyr, yocto)
-@enduml
\ No newline at end of file
diff --git a/diagrams/0001-meta-openharmony-zephyr-build-sequence-diagram.svg b/diagrams/0001-meta-openharmony-zephyr-build-sequence-diagram.svg
deleted file mode 100644
index 7e0437004757e411273839702c11595171061906..0000000000000000000000000000000000000000
--- a/diagrams/0001-meta-openharmony-zephyr-build-sequence-diagram.svg
+++ /dev/null
@@ -1,177 +0,0 @@
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1.0;"/><text fill="#666666" font-family="Comic Sans MS" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="112" x="871" y="473.0669">4. incorporates</text><!--link meta_zephyr to yocto--><!--link dev to meta_openharmonyn--><!--link meta_ohos_zephyr to meta_ohos_init_lite--><!--link meta_ohos_init_lite to meta_ohos_softbus_lite--><!--link meta_ohos_poky to meta_ohos_init--><!--link meta_ohos_poky to meta_ohos_softbus--><text fill="#FF0000" font-family="Comic Sans MS" font-size="10" lengthAdjust="spacingAndGlyphs" textLength="42" x="462" y="899.2822">Warning:</text><text fill="#888888" font-family="Comic Sans MS" font-size="10" lengthAdjust="spacingAndGlyphs" textLength="226" x="507" y="899.2822">Created for discussion, needs to be validated()</text><!--
-@startuml 0001-meta-openharmony-zephyr-build-sequence-diagram
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-skinparam rectangle<<system>> {
- StereotypeFontColor #FFFFFF
- FontColor #FFFFFF
- BackgroundColor #1168BD
- BorderColor #3C7FC0
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-skinparam rectangle<<external_system>> {
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- FontColor #FFFFFF
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- BorderColor #8A8A8A
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-skinparam database<<system>> {
- StereotypeFontColor #FFFFFF
- FontColor #FFFFFF
- BackgroundColor #1168BD
- BorderColor #3C7FC0
-}
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-skinparam database<<external_system>> {
- StereotypeFontColor #FFFFFF
- FontColor #FFFFFF
- BackgroundColor #999999
- BorderColor #8A8A8A
-}
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-skinparam rectangle<<container>> {
- StereotypeFontColor #FFFFFF
- FontColor #FFFFFF
- BackgroundColor #438DD5
- BorderColor #3C7FC0
-}
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-skinparam database<<container>> {
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- FontColor #FFFFFF
- BackgroundColor #438DD5
- BorderColor #3C7FC0
-}
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-
-skinparam backgroundColor #EEEBDC
-skinparam handwritten true
-skinparam defaultFontName "Comic Sans MS"
-center footer <font color=red>Warning:</font> Created for discussion, needs to be validated()
-
-rectangle "==Developer\n\n Anyone willing to build the OHOS based image" <<person>> as dev
-rectangle "==meta-openharmony\n<size:12>[System]</size>" <<boundary>> as meta_openharmonyn {
- rectangle "==meta-ohos-zephyr\n//<size:12>[meta-layer]</size>//\n\n OHOS configuration / adaptation layer for Zephyr" <<container>> as meta_ohos_zephyr
- rectangle "==meta-ohos-poky\n//<size:12>[meta-layer]</size>//\n\n OHOS configuration / adaptation layer for Poky" <<container>> as meta_ohos_poky
- rectangle "==meta-ohos-init\n//<size:12>[meta-layer]</size>//\n\n OHOS initialisation services for application devices" <<container>> as meta_ohos_init
- rectangle "==meta-ohos-init-lite\n//<size:12>[meta-layer]</size>//\n\n OHOS initialisation services for uC-based devices" <<container>> as meta_ohos_init_lite
- rectangle "==meta-ohos-softbus\n//<size:12>[meta-layer]</size>//\n\n OHOS softbus service for application devices" <<container>> as meta_ohos_softbus
- rectangle "==meta-ohos-softbus-lite\n//<size:12>[meta-layer]</size>//\n\n OHOS softbus service for uC-based devices" <<container>> as meta_ohos_softbus_lite
-}
-rectangle "==meta-zephyr\n//<size:12>[meta-layer]</size>//\n\n ZephyrOS meta-layer" <<container>> as meta_zephyr
-rectangle "==yocto-poky\n\n distro scaffolding: predefined meta-data, bitbake build system" <<external_system>> as yocto
-
-dev - -> meta_ohos_zephyr : "===1. selects OHOS Zephyr distribution\n//<size:12>[environment shell script]</size>//"
-meta_ohos_zephyr - -> yocto : "===2. sets up bitbake environment for OHOS Zephyr\n//<size:12>[local.conf.sample, bblayers.conf.sample]</size>//"
-dev - -> yocto : "===3. initiates the build\n//<size:12>[bitbake]</size>//"
-yocto - -> meta_ohos_init_lite : "===4. incorporates Zephyr-compatible OHOS layers"
-yocto - -> meta_ohos_softbus_lite : "===4. incorporates Zephyr-compatible OHOS layers"
-yocto - -> meta_zephyr : "===4. incorporates"
-
-dev -[hidden]D- yocto
-dev -[hidden]D- meta_openharmonyn
-meta_ohos_zephyr -[hidden]D- meta_ohos_init_lite
-meta_ohos_init_lite -[hidden]D- meta_ohos_softbus_lite
-meta_zephyr -[hidden]D- yocto
-@enduml
-
-PlantUML version 1.2018.13(Mon Nov 26 18:11:51 CET 2018)
-(GPL source distribution)
-Java Runtime: OpenJDK Runtime Environment
-JVM: OpenJDK 64-Bit Server VM
-Java Version: 11.0.9.1+1-Ubuntu-0ubuntu1.20.04
-Operating System: Linux
-OS Version: 5.4.0-53-generic
-Default Encoding: UTF-8
-Language: en
-Country: US
---></g></svg>
\ No newline at end of file
diff --git a/diagrams/meta-ohos_system_context.puml b/diagrams/meta-ohos_system_context.puml
deleted file mode 100644
index fcb47d6be8eb39a158ed23f6dd7f455e239c091b..0000000000000000000000000000000000000000
--- a/diagrams/meta-ohos_system_context.puml
+++ /dev/null
@@ -1,11 +0,0 @@
-@startuml meta-ohos_system_context_diagram
-!includeurl https://raw.githubusercontent.com/RicardoNiepel/C4-PlantUML/release/1-0/C4_Context.puml
-
-Person(dev, "Developer", "Anyone willing to build the OHOS based image")
-System(meta_openharmony, "meta-openharmony", "Open Harmony OS umbrella bitbake layer")
-System_Ext(yocto, "yocto-poky", "distro scaffolding: predefined meta-data, bitbake build system")
-
-Rel(dev, yocto, "selects configuration, initiates the build, deploys image to the target")
-Rel(yocto, meta_openharmony, "incorporates")
-
-@enduml
\ No newline at end of file
diff --git a/diagrams/meta-ohos_system_context_diagram.svg b/diagrams/meta-ohos_system_context_diagram.svg
deleted file mode 100644
index 020e95d792645cd2b284fa1c073dbc68d1ad3d78..0000000000000000000000000000000000000000
--- a/diagrams/meta-ohos_system_context_diagram.svg
+++ /dev/null
@@ -1,130 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentScriptType="application/ecmascript" contentStyleType="text/css" height="553px" preserveAspectRatio="none" style="width:266px;height:553px;" version="1.1" viewBox="0 0 266 553" width="266px" zoomAndPan="magnify"><defs/><g><!--entity dev--><rect fill="#08427B" height="101.4844" style="stroke: #073B6F; stroke-width: 1.5;" width="203" x="11.5" y="8"/><text fill="#FFFFFF" font-family="sans-serif" font-size="12" font-style="italic" lengthAdjust="spacingAndGlyphs" textLength="57" x="84.5" y="29.1387">«person»</text><text fill="#FFFFFF" font-family="sans-serif" font-size="16" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="90" x="68" y="46.8203">Developer</text><text fill="#FFFFFF" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="0" x="115" y="63.5889"/><text fill="#FFFFFF" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="179" x="21.5" y="79.8857">Anyone willing to build the</text><text fill="#FFFFFF" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="134" x="46" y="96.1826">OHOS based image</text><!--entity meta_openharmony--><rect fill="#1168BD" height="101.4844" style="stroke: #3C7FC0; stroke-width: 1.5;" width="214" x="6" y="441"/><text fill="#FFFFFF" font-family="sans-serif" font-size="12" font-style="italic" lengthAdjust="spacingAndGlyphs" textLength="57" x="84.5" y="462.1387">«system»</text><text fill="#FFFFFF" font-family="sans-serif" font-size="16" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="173" x="26.5" y="479.8203">meta-openharmony</text><text fill="#FFFFFF" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="0" x="115" y="496.5889"/><text fill="#FFFFFF" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="190" x="16" y="512.8857">Open Harmony OS umbrella</text><text fill="#FFFFFF" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="87" x="69.5" y="529.1826">bitbake layer</text><!--entity yocto--><rect fill="#999999" height="117.7813" style="stroke: #8A8A8A; stroke-width: 1.5;" width="177" x="24.5" y="246"/><text fill="#FFFFFF" font-family="sans-serif" font-size="12" font-style="italic" lengthAdjust="spacingAndGlyphs" textLength="115" x="55.5" y="267.1387">«external_system»</text><text fill="#FFFFFF" font-family="sans-serif" font-size="16" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="100" x="63" y="284.8203">yocto-poky</text><text fill="#FFFFFF" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="0" x="115" y="301.5889"/><text fill="#FFFFFF" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="122" x="50" y="317.8857">distro scaffolding:</text><text fill="#FFFFFF" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="153" x="34.5" y="334.1826">predefined meta-data,</text><text fill="#FFFFFF" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="142" x="42" y="350.4795">bitbake build system</text><!--link dev to yocto--><path d="M113,109.27 C113,147.09 113,199.39 113,240.26 " fill="none" id="dev-yocto" style="stroke: #666666; stroke-width: 1.0;"/><polygon fill="#666666" points="113,245.7,117,236.7,113,240.7,109,236.7,113,245.7" style="stroke: #666666; stroke-width: 1.0;"/><text fill="#666666" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="52" x="155.5" y="152.0669">selects</text><text fill="#666666" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="103" x="130" y="167.1997">configuration,</text><text fill="#666666" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="135" x="114" y="182.3325">initiates the build,</text><text fill="#666666" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="129" x="117" y="197.4653">deploys image to</text><text fill="#666666" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="75" x="146.5" y="212.5981">the target</text><!--link yocto to meta_openharmony--><path d="M113,364.12 C113,387 113,413.15 113,435.69 " fill="none" id="yocto-meta_openharmony" style="stroke: #666666; stroke-width: 1.0;"/><polygon fill="#666666" points="113,440.74,117,431.74,113,435.74,109,431.74,113,440.74" style="stroke: #666666; stroke-width: 1.0;"/><text fill="#666666" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="93" x="114" y="407.0669">incorporates</text><!--
-@startuml meta-ohos_system_context_diagram
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-rectangle "==yocto-poky\n\n distro scaffolding: predefined meta-data, bitbake build system" <<external_system>> as yocto
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-dev - -> yocto : "===selects configuration, initiates the build, deploys image to the target"
-yocto - -> meta_openharmony : "===incorporates"
-
-@enduml
-
-PlantUML version 1.2018.13(Mon Nov 26 18:11:51 CET 2018)
-(GPL source distribution)
-Java Runtime: OpenJDK Runtime Environment
-JVM: OpenJDK 64-Bit Server VM
-Java Version: 11.0.9.1+1-Ubuntu-0ubuntu1.20.04
-Operating System: Linux
-OS Version: 5.4.0-53-generic
-Default Encoding: UTF-8
-Language: en
-Country: US
---></g></svg>
\ No newline at end of file